Parole was denied Thursday for convicted killer Patricia Krenwinkel - a follower of cult leader Charles Manson - after officials investigated whether battered women's syndrome affected her state of mind at the time of the notorious murders nearly five decades ago.

Krenwinkel, 69, was previously denied parole 13 times for the 1969 slayings of pregnant actress Sharon Tate and four other people.

The next night, she helped kill grocer Leno LaBianca and his wife Rosemary in what prosecutors say was an attempt by Manson to ignite a race war.

They denied her parole for five more years after resuming the hearing at the California Institution for Women east of Los Angeles, where Krenwinkel is incarcerated.

The board did not immediately release the reason for its recommendation.

Krenwinkel is the longest serving female inmate in California.

State law requires commissioners to give "great weight" to whether physical, emotional or mental abuse affected offenders to the point that "it appears the criminal behavior was a result of that victimization."

Krenwinkel's attorney Keith Wattley did not respond to requests for comment before the hearing.

Krenwinkel was a 19-year-old secretary living with her older sister when she met the then 33-year-old Manson at a party. She testified that she left everything behind three days later to follow him because she believed they had a budding romantic relationship.

She said in December that her feelings faded when she realized Manson was routinely sleeping with other women including underage girls, became physically and emotionally abusive, and trafficked Krenwinkel to other men for sex.

She said she left him twice only to be brought back, that she was usually under the influence of drugs and rarely left alone.

"I thought I loved him. I thought - it started with love, and then turned to fear," she said.

She also recounted how she chased down and repeatedly stabbed Abigail Folger, 26, heiress to a coffee fortune, at Tate's home on Aug. 9, 1969, and helped Manson and other followers kill grocer Leno LaBianca and his wife Rosemary the following night.

Manson and his right-hand man, Charles "Tex" Watson, told her to "do something witchy," she said, so she stabbed La Bianca in the stomach with a fork, then took a rag and wrote "Helter Skelter," ''Rise" and "Death to Pigs" on the walls with his blood.

Prosecutors say the slayings were intended to spark an apocalyptic race war that Manson called "Helter Skelter," after a Beatles song.

Intimate partner battery was also briefly discussed during the last parole hearing for Manson follower Leslie Van Houten, 67, in 2016. The commissioners recommended that she be paroled, but Gov. Jerry Brown blocked her release.

Krenwinkel became the state's longest-serving female inmate when fellow Manson follower Susan Atkins, the third woman convicted in the series of slayings, died of cancer in prison in 2009.

Anthony DiMaria, the nephew of victim Thomas Jay Sebring who died during the first massacre, criticized commissioners' consideration of intimate partner battering, part of what he said "has become the twisted metamorphosis of a killer into victim."

"Sadly, there are millions of intimate partner battery victims in this country," he said in remarks prepared for Thursday's hearing. "But fortunately, it's safe to say, that almost none of them suddenly become a maniacal predator that stalks, pounces, butchers and mutilates her victims."